Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1756-1766.doi: 10.13278/j.cnki.jjuese.20170133

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Engineering Geological Characteristics of Super High Rise and Thick Loess Foundation in Qingyang Area

Song Yu1,2, Luo Xiaobo1, Lu Chenggong1, Chen Zhichao1, Lu Guowen1   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou 730050, China
  • Received:2017-05-11 Published:2018-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(51468040)

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Abstract: In order to deeply understand the geological features of loess, the super high-rise and thick loess foundation was selected as the study object in Qingyang, to investigate the physical and mechanical properties of Longdong loess. Mainly through in-situ and indoor experiments, all sides of loess engineering performance were comprehensively analyzed and evaluated, including the under structure, depth of distribution, liquid limit, plastic limit, index of plasticity, void ratio, collapsible deformation, shear wave velocity, bearing capacity of foundation, shear strength, and so on. The results showed that:Malan loess within 5.0 m had strong collapsibility, small cohesive force, and large compressibility; with the gradual increase of loess thickness, the cohesive force of Lishi loess and Wucheng loess increased, while the compressibility decreased, showing a slight to moderate collapsibility;when the pressure of Malan loess exceeded 400 kPa, the pressure of Lishi loess was greater than 600 kPa, and that of Wucheng loess was greater than 200 kPa, with no collapsibility; the maximum dry density was 1.67-1.76 g/cm3, and the optimal water content was between 16.6% and 17.7% within 15.0 m; the high water content was relatively concentrated in the region below 62.0 m of groundwater level and above 90.0% of saturation.

Key words: Longdong loess, live experiment, indoor experiment, project performance, collapsibility

CLC Number: 

  • TU192
[1] 王永焱,林在贯.中国黄土的结构特征及物理力学性质[M].北京:科学出版社,1990. Wang Yongyan, Lin Zaiguan. The Structure Characteristics and Physical Mechanical Properties of Loess China[M].Beijing:Science Press,1990.
[2] 蒲毅彬.陇东黄土湿陷过程的CT结构变化研究[J].岩土工程学报,2000,2(1):49-54. Pu Yibin. The Study of Long-Dong Loess Collapsibility Process of Structural Change in the CT[J].Chinese Journal of Geotechnical Engineering, 2000, 2(1):49-54.
[3] 雷胜友,唐文栋.黄土在受力和湿陷过程中微结构变化的CT扫描分析[J].岩土力学与工程学报,2004,24(23):4166-4169. Lei Shengyou, Tang Wendong. The Scan of Stress and Microstructure Change in the Process of Collapsibility Loess[J].Chinese Journal of Rock Mechanics and Engineering, 2004, 24(23):4166-4169.
[4] 刘志斌,张勇,方伟,等.黄土电阻率与其压实特性间关系试验研究[J].西安科技大学学报,2013,33(1):84-88. Liu Zhibin, Zhang Yong, Fang Wei, et al. The Experimental Study of Relationship Between Resistivity and Compaction in Chinese Loess[J]. Xi'an University of Architecture and Technology, 2013, 33(1):84-88.
[5] 王林浩,白晓红,冯俊琴.压实黄土状填土抗剪强度指标的影响因素探讨[J].岩土工程学报,2010,32(增刊2):133-135. Wang Linhao, Bai Xiaohong, Feng Junqin. The Discussion of the Influence Factors of Shear Strength Indexes Under Compacted Loess[J].Chinese Journal of Geotechnical Engineering, 2010, 32(Sup.2):133-135.
[6] 孙海妹,王兰明,王平,等.饱和兰州黄土液压过程中孔压和应变发展的试验研究[J].岩土力学,2010,31(11):3464-3468. Sun Haimei, Wang Lanming, Wang Ping, et al. The Hydraulic Experimental Study of Development of Pore Pressure and Strain Under the Saturated in Lanzhou[J]. Rock and Soil Mechanics, 2010, 31(11):3464-3468.
[7] Disguised A M, Rogers C D, Smalley I J. Formation and Collapse of Metastable Particle Packing and Open Structures Unloess Deposits[J].Engineering Geology, 1977, 48:101-115.
[8] Liu M D, Carter J P. Volumetric Deformation of Natural Clays[J].Geotechnique, 2003, 3(2):236-252.
[9] Rouainia M, Muir Wood D. Akinematic Hardening Model for Natural Clays with Loss of Structure[J].Geotechnique, 2000, 50(2):153-164.
[10] Li Ping, Vanapalli S, Li Tonglu. Review of Collapse Triggering Mechanism of Collapsible Soils Due to Wetting[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2016, 8:256-274.
[11] 潘天有. 土的物理力学与工程特性指标分析[J].水利与建筑工程学报,2011,9(5):87-92. Pan Tianyou. The Analysis of Soil Physics and Mechanics and Engineering Property Index[J]. Journal of Water Conservancy and Architectural Engineering, 2011, 9(5):87-92.
[12] 岩土工程勘察规范GB 50021-2001[S].北京:中国建筑工业出版社,2002. Geotechnical Investigation Specifications GB 50021-2001[S]. Beijing:China Building Industry Press, 2002.
[13] 高层建筑岩土工程勘察规程JGJ 72[S].北京:中国建筑工业出版社,2004. Specification for Geotechnical Investigation of Tall Buildings JGJ 72[S]. Beijing:China Building Industry Press, 2004.
[14] 湿陷性黄土地区建筑规范GB 50025-2004[S].北京:中国建筑工业出版社,2004. Code for Building Construction in Collapsible Loess Regions GB 50025-2004[S]. Beijing:China Building Industry Press, 2004.
[15] 建筑工程地质勘探与取样技术规程JGJ/T87-2012[S].北京:中国建筑工业出版社,2012. Technical Specifications for Engineering Geological Prospecting and Sampling of Constructions JGJ/T87-2012[S].Beijing:China Building Industry Press, 2012.
[16] 土工试验方法标准GB/T 50123-1999[S].北京:中国计划出版社,1999. Geotechnical Test Method Standard GB/T 50123-1999[S]. Beijing:China Planning Press, 1999.
[17] 方祥位,申春尼,李春海,等.陕西蒲城Q2黄土湿陷变形特征研究[J].岩土力学,2013,34(增刊2):115-120. Fang Xiangwei, Shen Chunni, Li Chunhai, et al. The Study of Collapsibility Deformation of Q2 in Pucheng, Shaanxi[J]. Rock and Soil Mechanics, 2013, 34(Sup.2):115-120.
[18] 杨校辉,黄雪峰,朱彦鹏,等. 大厚度自重湿陷性黄土地基处理深度和湿陷性评价试验研究[J].岩土力学与工程学报,2014,35(5):1063-1074. Yang Xiaohui, Huang Xuefeng, Zhu Yanpeng, et al. The Experimental Study of Big Thickness Collapsible Loess Foundation Treatment Depth and Evaluation of Collapsibility[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 35(5):1063-1074.
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